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Pi4J / pi4j-v1

DEPRECATED Java I/O library for Raspberry Pi (GPIO, I2C, SPI, UART)
http://www.pi4j.com
Apache License 2.0
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Unable to load [libpi4j.so] using path: [/lib/raspberrypi/dynamic/libpi4j.so] #491

Closed pavankuppa closed 3 years ago

pavankuppa commented 4 years ago

It seems the path is not loading which is present inside the jar file

Installed wiringpi too - sudo apt-get install wiringpi

$ ldconfig -p | grep wiringPi.so
libwiringPi.so.2 (libc6,hard-float) => /lib/arm-linux-gnueabihf/libwiringPi.so.2

Even I extract the jar and keep libpi4j.so in lib folder as(raspberrypi/dynamic) where jar are placed

<--Pi4J--> GPIO Blink Example ... started.
Jun 10, 2020 6:43:18 AM com.pi4j.util.NativeLibraryLoader load
SEVERE: Unable to load [libpi4j.so] using path: [/lib/raspberrypi/dynamic/libpi4j.so]
java.lang.UnsatisfiedLinkError: /tmp/libpi4j7035464008728984924.so: libwiringPi.so: cannot open shared object file: No such file or directory
        at java.base/java.lang.ClassLoader$NativeLibrary.load0(Native Method)
        at java.base/java.lang.ClassLoader$NativeLibrary.load(ClassLoader.java:2442)
        at java.base/java.lang.ClassLoader$NativeLibrary.loadLibrary(ClassLoader.java:2498)
        at java.base/java.lang.ClassLoader.loadLibrary0(ClassLoader.java:2694)
        at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2627)
        at java.base/java.lang.Runtime.load0(Runtime.java:768)
        at java.base/java.lang.System.load(System.java:1834)
        at com.pi4j.util.NativeLibraryLoader.loadLibraryFromClasspath(NativeLibraryLoader.java:159)
        at com.pi4j.util.NativeLibraryLoader.load(NativeLibraryLoader.java:105)
        at com.pi4j.wiringpi.Gpio.<clinit>(Gpio.java:189)
        at com.pi4j.io.gpio.RaspiGpioProvider.<init>(RaspiGpioProvider.java:69)
        at com.pi4j.io.gpio.RaspiGpioProvider.<init>(RaspiGpioProvider.java:51)
        at com.pi4j.platform.Platform.getGpioProvider(Platform.java:125)
        at com.pi4j.platform.Platform.getGpioProvider(Platform.java:118)
        at com.pi4j.io.gpio.GpioFactory.getDefaultProvider(GpioFactory.java:109)
        at com.pi4j.io.gpio.impl.GpioControllerImpl.<init>(GpioControllerImpl.java:53)
        at com.pi4j.io.gpio.GpioFactory.getInstance(GpioFactory.java:91)
        at BlinkGpioExample.main(BlinkGpioExample.java:57)

Exception in thread "main" java.lang.UnsatisfiedLinkError: 'int com.pi4j.wiringpi.Gpio.wiringPiSetup()'
        at com.pi4j.wiringpi.Gpio.wiringPiSetup(Native Method)
        at com.pi4j.io.gpio.RaspiGpioProvider.<init>(RaspiGpioProvider.java:69)
        at com.pi4j.io.gpio.RaspiGpioProvider.<init>(RaspiGpioProvider.java:51)
        at com.pi4j.platform.Platform.getGpioProvider(Platform.java:125)
        at com.pi4j.platform.Platform.getGpioProvider(Platform.java:118)
        at com.pi4j.io.gpio.GpioFactory.getDefaultProvider(GpioFactory.java:109)
        at com.pi4j.io.gpio.impl.GpioControllerImpl.<init>(GpioControllerImpl.java:53)
        at com.pi4j.io.gpio.GpioFactory.getInstance(GpioFactory.java:91)
        at BlinkGpioExample.main(BlinkGpioExample.java:57)
savageautomate commented 4 years ago

Pi4J version 2.0 includes a Java system property you can include to override this default extraction behavior. Perhaps we should add that support to v1.3 which would at least allow you to bypass the SO extract from JAR logic and just let you tell the library where to find the SO file.

FDelporte commented 4 years ago

@pavankuppa see https://v2.pi4j.com/library-path for more info

savageautomate commented 3 years ago

Related to #454

Closing with workaround in Pi4J v1.3.

Added support for system property ("pi4j.library.path") to override default embedded library resolution and allow for user explicitly defined resolution path for libpi4j.so native library.

If there is no /tmp available, then the Pi4J JAR does not have a location to extract the embedded ("libpi4j.so") native library. The library will need to be extracted and place on the system and a path provided using this system property. Note: you can also use "system" or "local" to have the JAR look for the "libpi4j.so" native library in the system path or in the local runtime directory alongside the JAR file.